Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at 000001ff; EIP is at __math_state_restore+0x5e/0x80

My laptop was freezed while it was runned XFCE + firefox, opera, truecrypt, konsole and 'apt-get install gnome' (with gnome3 ppa)

I'll put screenshot of it later in comments.

kern.log record:

Apr 7 01:49:59 zed-laptop kernel: [ 1490.114788] BUG: unable to handle kernel NULL pointer dereference at 000001ff
Apr 7 01:49:59 zed-laptop kernel: [ 1490.114916] IP: [<c100429e>] __math_state_restore+0x5e/0x80
Apr 7 01:49:59 zed-laptop kernel: [ 1490.114988] *pde = db25b067
Apr 7 01:49:59 zed-laptop kernel: [ 1490.115021] Oops: 0000 [#1] SMP
Apr 7 01:49:59 zed-laptop kernel: [ 1490.115060] last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
Apr 7 01:49:59 zed-laptop kernel: [ 1490.115140] Modules linked in: xts gf128mul fpu aesni_intel cryptd aes_i586 aes_generic dm_crypt rfcomm sco binfmt_misc bnep l2cap snd_hda_codec_hdmi wl(P) lib80211 arc4 snd_hda_codec_idt snd_hda_intel snd_hda_codec ppdev snd_hwdep dell_wmi sparse_keymap snd_pcm xfs snd_seq_midi exportfs snd_rawmidi brcm80211(C) dell_laptop uvcvideo dcdbas btusb snd_seq_midi_event mac80211 snd_seq bluetooth psmouse serio_raw videodev snd_timer snd_seq_device cfg80211 intel_ips snd soundcore snd_page_alloc parport_pc lp parport mmc_block i915 drm_kms_helper e1000e ahci drm libahci sdhci_pci i2c_algo_bit sdhci video
Apr 7 01:49:59 zed-laptop kernel: [ 1490.115911]
Apr 7 01:49:59 zed-laptop kernel: [ 1490.115937] Pid: 2825, comm: crashreporter Tainted: P C 2.6.38-8-generic #40-Ubuntu Dell Inc. Latitude E4310/0T26D8
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116142] EIP: 0060:[<c100429e>] EFLAGS: 00210086 CPU: 2
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116201] EIP is at __math_state_restore+0x5e/0x80
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116251] EAX: 00000000 EBX: ef6b4000 ECX: f6079940 EDX: ffffffff
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116314] ESI: f6079940 EDI: c150ad30 EBP: ef6b5f98 ESP: ef6b5f8c
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116377] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116431] Process crashreporter (pid: 2825, ti=ef6b4000 task=f6079940 task.ti=ef6b4000)
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116512] Stack:
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116533] ef6b5fb4 bfacf7b4 c150ad30 ef6b5fa0 c10042f9 ef6b5fac c150ad40 01153ff4
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116623] bfacf790 c150a31f 01153ff4 00000007 00000023 bfacf7b4 bfacf877 bfacf790
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116715] 00000877 0000007b 0000007b 00000000 00000033 ffffffff 011076b3 00000073
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116808] Call Trace:
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116839] [<c150ad30>] ? do_device_not_available+0x0/0x20
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116898] [<c10042f9>] math_state_restore+0x39/0x50
Apr 7 01:49:59 zed-laptop kernel: [ 1490.116952] [<c150ad40>] do_device_not_available+0x10/0x20
Apr 7 01:49:59 zed-laptop kernel: [ 1490.117009] [<c150a31f>] error_code+0x67/0x6c
Apr 7 01:49:59 zed-laptop kernel: [ 1490.117055] Code: 2f 85 c9 75 2b 83 4b 0c 01 80 86 80 01 00 00 01 8b 1c 24 8b 74 24 04 8b 7c 24 08 89 ec 5d c3 8d b6 00 00 00 00 8b 86 4c 03 00 00 <0f> ae 08 eb d5 e8 c8 89 02 00 90 83 c8 08 e8 cf 89 02 00 90 b8
Apr 7 01:49:59 zed-laptop kernel: [ 1490.117397] EIP: [<c100429e>] __math_state_restore+0x5e/0x80 SS:ESP 0068:ef6b5f8c
Apr 7 01:49:59 zed-laptop kernel: [ 1490.117486] CR2: 00000000000001ff
Apr 7 01:49:59 zed-laptop kernel: [ 1490.133513] dell-wmi: Received unknown WMI event (0x11)
Apr 7 01:49:59 zed-laptop kernel: [ 1490.621374] dell-wmi: Received unknown WMI event (0x11)
Apr 7 01:49:59 zed-laptop kernel: [ 1490.625028] ---[ end trace 5fd815776c024a5a ]---
Apr 7 01:53:14 zed-laptop kernel: [ 1685.587241] mmc0: card f96c removed

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-generic 2.6.38.8.22
Regression: Yes
Reproducible: No
ProcVersionSignature: Ubuntu 2.6.38-8.40-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: wl
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
ArecordDevices:
 **** List of CAPTURE Hardware Devices ****
 card 0: Intel [HDA Intel], device 0: STAC92xx Analog [STAC92xx Analog]
   Subdevices: 1/1
   Subdevice #0: subdevice #0
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: zed 1511 F.... xfce4-volumed
                      zed 1544 F.... pulseaudio
CRDA: Error: [Errno 2] No such file or directory
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xf5460000 irq 43'
   Mixer name : 'Intel IbexPeak HDMI'
   Components : 'HDA:111d7605,10280410,00100104 HDA:80862804,80860101,00100000'
   Controls : 19
   Simple ctrls : 11
Date: Thu Apr 7 02:07:50 2011
Frequency: This has only happened once.
HibernationDevice: RESUME=UUID=1aebbc8b-64e1-4ad5-aeca-0117845027e4
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
MachineType: Dell Inc. Latitude E4310
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=040ea193-0e4f-4079-8f43-2ada2199cbe1 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-8-generic N/A
 linux-backports-modules-2.6.38-8-generic N/A
 linux-firmware 1.49
SourcePackage: linux
StagingDrivers: brcm80211
Title: [STAGING]
UpgradeStatus: No upgrade log present (probably fresh install)
UserAsoundrc:
 # ALSA library configuration file

 # Include settings that are under the control of asoundconf(1).
 # (To disable these settings, comment out this line.)
 </home/zed/.asoundrc.asoundconf>
dmi.bios.date: 08/10/2010
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A04
dmi.board.name: 0T26D8
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA04:bd08/10/2010:svnDellInc.:pnLatitudeE4310:pvr0001:rvnDellInc.:rn0T26D8:rvrA01:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E4310
dmi.product.version: 0001
dmi.sys.vendor: Dell Inc.